Running an amp in parallell mode |
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goodgroove
Young Croc Joined: 21 December 2005 Status: Offline Points: 631 |
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Posted: 15 March 2012 at 9:05pm |
Hi hoping to understand this correctly but if I have an amp that is 1200wpc into 4ohms running stereo thats a total of 2400w giving 600w per speaker , this amp into 4 ohm bridged mode will give 3200w into 2 8ohm speakers but in parallell mode it will be 4 speakers going down to a 2ohm load getting 3200w with each speaker getting 800w is this correct ?
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ceharden
The 10,000 Points Club Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776 |
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Running in parallel mode will give you the same power into 4 speakers as running in stereo, there's no advantage that I can see. Although the total load will be 2Ohms, each amp channel will see 4Ohms. Just as running in bridge mode into 4Ohms, the amp channels will see 2Ohms each.
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Dub Specialist
Old Croc Joined: 30 December 2011 Location: Smethwick Status: Offline Points: 3230 |
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to be honest ive never really understood parallell mono i have a number of amps some crown ect that have parallell mono mode what exactly is the difference?
theres got to be a difference b'cus why is the mode there? can some pro on here explain please...
thanks...
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levyte357
The 10,000 Points Club Joined: 10 May 2004 Location: UK, London Status: Offline Points: 11743 |
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Switching amp into parallel mode just routes signal input to channel1 to be input to channel 2.
E.g, you want the same signal amplified thru both channels. As ceharden already said, it's just the same as using in stereo. |
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"Who am I? I'm the guy who does his job.. You must be the other guy".
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Dub Specialist
Old Croc Joined: 30 December 2011 Location: Smethwick Status: Offline Points: 3230 |
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i tell ya tho if i was the copy n paste of the internet it would mek ya laugh.sooo many different answers man....
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cravings
Old Croc Joined: 30 January 2007 Location: Ireland Status: Offline Points: 7442 |
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paralell often means that channel a and b will both reproduce the signal going into channel.. so it's basically a mono amp, but still 2 separate channels. the output figures would be the same as you originally said above (2 x 1200 @ 4 ohm)
edit: lev said it better.. i'm leaving piles of tabs open for too long obviously Edited by cravings - 16 March 2012 at 2:01am |
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Chris Murphy
Registered User Joined: 23 December 2011 Location: Walsall Status: Offline Points: 31 |
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Theres a bit of a difference between parallel inputs and parallel mode, especially with crown. Macrotechs require you to install a wire between positive output terminals and run all speakers from channel one, inputing channel one. Compare that to a qsc which does literally just link the input channels when in parallel so that you dont have to input it twice or link it with a cable externally if you want both channels feeding with the same signal. I guess its sort of another type of bridge mode with certain amps, only difference you can drive a 1ohm load.
Quote from crown manual 3.3.3 Parallel-Mono Operation Parallel-Mono mode is intended for driving loads with a total impedance of less than 4 ohms (see Section 3.3.2 if the load is 4 ohms or greater). Installing the amplifier in Parallel-Mono mode is different from the other modes and requires special attention. To activate Parallel-Mono mode, turn off the amplifier, wait at least 10 seconds, and slide the stereo/mono switch to the PARALLEL MONO position. Connect the input signal to Channel 1, and do not use the Channel 2 input. Both outputs will now receive the signal from the Channel 1 input. Note: The Channel 2 input jack and level control are disconnected in Parallel-Mono mode. A signal feeding Channel 2 will have no effect on the output. Install a jumper wire between the positive (+) outputs of Channel 1 and 2 that is at least 14 gauge in size. Then, connect the load to the output of Channel 1 as shown in Figure 3.6. The positive (+) lead from the load connects to the positive (+) Channel 1 terminal, and the negative (–) lead from the load connects to the negative (–) Channel 1 terminal. http://www.crownaudio.com/pdf/legacy/103169.pdf Quote from Qsc manual :) Parallel Mode - This setting connects both inputs together. One signal feeds both channels. Each channel's Gain control and loudspeaker connection remain independent. http://www.qscaudio.com/pdfs/manuals/RMX_3RU_user_manual_EN_revF.pdf Edited by Chris Murphy - 16 March 2012 at 2:28am |
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I consider myself an intermediate rather than an expert :)
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knet94
Old Croc Joined: 31 March 2008 Location: NW London Status: Offline Points: 1510 |
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Come on Spanners tell us what the advantages are.
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kedwardsleisure
Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4949 |
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Certain RCF/DB Tech amps also use internal relays to parallel the output channels in parallel mode, though it's not the norm.
Some amps in parallel mode are just like the crowns in that you can parallel the output terminals to drive very low impedance loads; however this means the circuitry in the amps is carefully matched between channels and shouldn't be done willy-nilly unless the manual says so. |
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Kevin
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GEB
Old Croc Joined: 13 November 2009 Location: East Midlands Status: Offline Points: 1993 |
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Comes in handy when you've misplaced one of your xlr link cables when setting up for a gig!
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Norseman
Registered User Joined: 04 March 2013 Location: Torquay Status: Offline Points: 124 |
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yeah it appears to be good for subs etc in mono, coming from LMS use one output for two bins etc, rather than chewing up two LMS outputs for two bins...
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